BN Nook

Barnes & Noble's new Nook is smaller, lighter, and has decidedly more geeky inside -- and it's now shipping. For $139, you can get now get the diminutive e-reader that's powered by Android 2.1. How quickly will it be hacked? We're betting a matter of hours, if it's anything like its older, bigger and more colorful cousin, the Nook Color.

But that raises the question: Aside from the cool factor of hacking open this little guy, would you really want to use a 6-inch black-and-white e-reader like a tablet?

Purchase: Nook at Barnes & Noble; More: Nook Color forums